Coffee for the liver: a mechanistic approach

The liver, which is essential for metabolism and detoxification, is vulnerable to various damaging factors, including viral infections, excessive alcohol consumption, and a diet high in fat and sugar. Coffee, one of the most widely consumed beverages worldwide, is valued not only for its flavor and aroma but also for its potential health benefits. In this context, the protective effects of its consumption against liver diseases have been extensively studied. Epidemiological, experimental, and clinical evidence suggests that regular coffee consumption reduces the risk of liver disease and slows its progression to fibrosis, cirrhosis, and hepatocellular carcinoma. These benefits are attributed to its complex composition comprising various bioactive compounds such as caffeine, polyphenols, and diterpenes, which have anti-inflammatory, antioxidant, antifibrotic, and anticancer properties. Coffee mitigates liver damage and slows disease progression by modulating cellular responses, reducing oxidative stress, and restoring metabolic homeostasis. Several studies have demonstrated that coffee and its bioactive compounds regulate key pathways involved in inflammation, oxidative stress, and fibrosis while modulating hepatic lipid metabolism and insulin resistance. Furthermore, coffee can alter the composition of the gut microbiota, contributing to its hepatoprotective effects. Additionally, coffee consumption has been associated with lower liver enzyme levels, less liver structural damage in patients with various liver diseases, and reduced liver disease-related mortality. This narrative review explores the impact of coffee consumption on liver health and discusses epidemiological evidence, cellular and molecular mechanisms, and clinical implications for the prevention, treatment, and management of liver diseases.